diff --git a/LuaMenu/configs/gameConfig/byar/sidedata.lua b/LuaMenu/configs/gameConfig/byar/sidedata.lua
index cc64521ec..e2d63af75 100644
--- a/LuaMenu/configs/gameConfig/byar/sidedata.lua
+++ b/LuaMenu/configs/gameConfig/byar/sidedata.lua
@@ -9,4 +9,13 @@ return {
 		name = "Cortex",
 		logo = SIDEPICS_DIR .. "cortex.png",
 	},
+	{
+		name = "Legion",
+		logo = SIDEPICS_DIR .. "legion.png",
+		requiresModoption = "experimentallegionfaction",
+	},
+	{
+		name = "Random",
+		logo = SIDEPICS_DIR .. "random.png",
+	},
 }
diff --git a/LuaMenu/configs/gameConfig/byar/sidepics/legion.png b/LuaMenu/configs/gameConfig/byar/sidepics/legion.png
new file mode 100644
index 000000000..3337d9954
Binary files /dev/null and b/LuaMenu/configs/gameConfig/byar/sidepics/legion.png differ
diff --git a/LuaMenu/widgets/gui_side_change_window.lua b/LuaMenu/widgets/gui_side_change_window.lua
index a76c43b2f..c07b42604 100644
--- a/LuaMenu/widgets/gui_side_change_window.lua
+++ b/LuaMenu/widgets/gui_side_change_window.lua
@@ -20,11 +20,22 @@ local function CreateSideChangeWindow(opts)
 	local Configuration = WG.Chobby.Configuration
 	local sidedata = Configuration:GetSideData()
 
+	local battleLobby = WG.LibLobby.localLobby
+	local battle = battleLobby:GetBattle(battleLobby:GetMyBattleID())
+	if not battle then
+		battleLobby = WG.LibLobby.lobby
+	end
+
 	local factionMap = {}
 	local factionNames = {}
+
+	local modoptions = battleLobby.modoptions
+
 	for index, data in ipairs(sidedata) do
-		factionMap[data.name] = index - 1
-		table.insert(factionNames, data.name)
+		if not data.requiresModoption or (modoptions and modoptions[data.requiresModoption] == "1") then
+			factionMap[data.name] = index - 1
+			table.insert(factionNames, data.name)
+		end
 	end
 
 	local sideChangeWindow = Window:New {
@@ -89,6 +100,7 @@ local function CreateSideChangeWindow(opts)
 		y = 150,
 		width = sideChangeWindow.width * 0.5,
 		height = 40,
+		caption = Configuration:GetSideById(selectedFaction).name or "",
 		items = factionNames,
 		parent = sideChangeWindow,
 		objectOverrideFont = WG.Chobby.Configuration:GetFont(2),
diff --git a/libs/liblobby/lobby/interface_skirmish.lua b/libs/liblobby/lobby/interface_skirmish.lua
index 94a385235..fd37fb66e 100644
--- a/libs/liblobby/lobby/interface_skirmish.lua
+++ b/libs/liblobby/lobby/interface_skirmish.lua
@@ -88,6 +88,11 @@ function InterfaceSkirmish:_StartScript(gameName, mapName, playerName, friendLis
 
 	for userName, data in pairs(self.userBattleStatus) do
 		if data.allyNumber and not data.aiLib then --every player must have an allynumber!
+			local sideData = WG.Chobby.Configuration:GetSideById(data.side)
+			if sideData and sideData.requiresModoption and
+			   (not self.modoptions or self.modoptions[sideData.requiresModoption] ~= "1") then
+				data.side = 0
+			end
 			players[playerCount] = {
 				Name = userName,
 				Team = teamCount,
@@ -153,6 +158,11 @@ function InterfaceSkirmish:_StartScript(gameName, mapName, playerName, friendLis
 	local chickenAdded = false
 	for userName, data in pairs(self.userBattleStatus) do
 		if data.allyNumber and data.aiLib then
+			local sideData = WG.Chobby.Configuration:GetSideById(data.side)
+			if sideData and sideData.requiresModoption and
+			   (not self.modoptions or self.modoptions[sideData.requiresModoption] ~= "1") then
+				data.side = 3	--Random faction
+			end
 			if friendAllyTeam == data.allyNumber and aiReplaceCount > 0 and not string.find(data.aiLib, "Raptor") then
 				aiReplaceCount = aiReplaceCount - 1
 			else
diff --git a/libs/liblobby/lobby/lobby.lua b/libs/liblobby/lobby/lobby.lua
index abcd7cf4c..98c8adad3 100644
--- a/libs/liblobby/lobby/lobby.lua
+++ b/libs/liblobby/lobby/lobby.lua
@@ -1236,6 +1236,15 @@ function Lobby:_OnJoinedBattle(battleID, userName, scriptPassword)
 		Spring.Log(LOG_SECTION, LOG.WARNING, "_OnJoinedBattle nonexistent battle.")
 		return
 	end
+	if userName == self:GetMyUserName() then
+		local lastFaction = WG.Chobby.Configuration.lastFactionChoice
+		if lastFaction then
+			local sideData = WG.Chobby.Configuration:GetSideById(lastFaction)
+			if sideData and sideData.requiresModoption and (not self.modoptions or self.modoptions[sideData.requiresModoption] ~= "1") then
+				WG.Chobby.Configuration.lastFactionChoice = 0
+			end
+		end
+	end
 	local found = false
 	local users = battle.users
 	for i = 1, #users do